1908.] PUBLIC DOCUMENT — No. 33. 31 



potash. The larger application of manure alone gave a slightly 

 higher yield of sound corn. The combination of manure and 

 potash gave the higher yields of soft corn and stover. There 

 was not much money difference in the value of the crops pro- 

 duced under the two systems, while the cost of the smaller ap- 

 plication of manure and potash was at the rate of about $6 per 

 acre less than the cost of the larger application of manure alone. 



VI. — Experiment to determine the relative value, as meas- 

 ured by crop production, of a considerable number of phos- 

 phates used in quantities to furnish equal phosphoric acid 

 to each plot. The phosphates under comparison were : line 

 ground, — apatite, South Carolina rock and Tennessee rock 

 phosphates; Florida soft phosphate, basic slag meal, dissolved 

 bone black, raw bone meal, dissolved bone meal, steamed bone 

 meal and acid phosphate. The crop of the past season was 

 mixed hay. The yields on the different phosphates varied 

 relatively little. Even the plots which have received no 

 phosphates during the eleven years the experiment has con- 

 tinued gave a yield at the first crop at the average rate of about 

 4 tons to the acre, while the highest yield obtained on any of 

 the phosphates at first cutting was only 9,240 pounds. 



VII. — Soil tests. The past season was the nineteenth dur- 

 ing which the south soil test reported upon has continued. 

 The results show the surpassing importance for the production 

 of satisfactory corn crops of a liberal supply of potash. 



VIII. — Experiment in the application of manures and fer- 

 tilizers for grass. The materials used are: first, barnyard 

 manure ; second, wood ashes ; and third, a combination of 

 fine-ground bone and potash. The average yield of hay dur- 

 ing the past season was at the rate of 5,005 pounds. The 

 average for the fifteen years during which the experiment has 

 been continued has been 6,296 pounds. 



IX. — Winter versus spring application of manure on a slope. 

 The crop of the past year was mixed grass and clover. The 

 experiment was a test simply of the residual fertility from 

 previous applications, as no manure was applied this year, as 

 it was feared it would cause serious lodging of the crop. This 

 judgment was justified by the result. The crop was extremely 

 heavy, and considerably lodged in spite of the fact that manure 

 was not applied this year. The differences in yield were small, 



